Feature Summary: D-Mode for Optimized Outbound Delivery
D-Mode is a feature key-enabled feature that optimizes certain email gateways for outbound email delivery. Features specific to inbound mail handling are disabled in D-Mode.
Features Unique to D-Mode-Enabled Email Gateways
- 256 Virtual Gateway Addresses - The Cisco Virtual Gateway technology allows you to configure enterprise mail gateways for all domains you host — with distinct IP addresses, hostname and domains — and create separate corporate email policy enforcement and anti-spam strategies for those domains, while hosted within the same physical email gateway. See information about “Customizing Listeners” in Configuring the Gateway to Receive Email
- IronPort Mail Merge (IPMM) - IronPort Mail Merge (IPMM) removes the burden of generating individual personalized messages from customer systems. By removing the need to generate thousands of individual messages and transmit them between message generating systems and the email gateway, users benefit from the decreased load on their systems and increased throughput of email delivery. For more information, see Sending Bulk Mail Using IronPort Mail Merge (IPMM).
- Resource-conserving bounce setting - You can configure D-Mode-enabled email gateways to detect potential blocked destinations and bounce all messages bound for that destination. For more information, see Configuring Resource-Conserving Bounce Settings.
- Enhanced performance for outbound delivery
Standard Features Disabled in D-Mode-Enabled Email Gateways
- IronPort anti-spam scanning and on or off box spam quarantining — Because anti-spam scanning pertains mostly to incoming mail, the IronPort Anti-Spam scanning engine is disabled. The Anti-Spam chapter is, therefore, not applicable.
- Outbreak Filters — Because the Outbreak Filters feature is used to quarantine incoming mail, this feature is disabled on D-Mode-enabled email gateways. Information in the Outbreak Filters chapter is, therefore, not applicable.
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Service Logs - The Service Logs feature is disabled on D-mode enabled email gateways.
- Reporting — Reporting is limited. Some reports are not available, and the reporting that does occur is set to run at a very limited level for performance reasons.
Note |
The totals shown in the Email Security Monitor Overview report for D-Mode-enabled email gateways may erroneously include spam and suspect spam counts, even though these features are disabled on D-Mode-enabled email gateways. |
- Data Loss Prevention — DLP scanning for outgoing messages is disabled on D-Mode-enabled email gateways.
Standard Features Applicable to D-Mode-Enabled Email Gateways
Feature |
More Information |
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Anti-virus scanning |
See Anti-Virus |
Domain Key signing |
DKIM/Domain Keys is a method for verifying authenticity of email based on a signing key used by the sender. See Email Authentication |
Centralized management |
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Delivery throttling |
For each domain, you can assign a maximum number of connections and recipients that will never be exceeded by the system in a given time period. This “good neighbor” table is defined through the destconfig command. For more information, see Controlling Email Delivery Using Destination Controls. |
Bounce Verification |
Verify the authenticity of bounce messages. See Bounce Verification. |
Delegated administration |
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Trace (debug) |
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VLAN, NIC-pairing |
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Optional Anti-virus engine |
You can add optional anti-virus scanning to ensure the integrity of your outbound messages. See Anti-Virus Scanning Overview. |